Learning Outcomes:
By the end of the lesson, students should be able to: (1) Describe methods of separation and purification for the components of the following types of mixtures:
(i) solid-solid (ii) solid-liquid (iii) liquid-liquid (miscible and immiscible)
(2) Techniques to be covered for separations and purification include:
(i) use of a suitable solvent, filtration and crystallisation or evaporation
(ii) distillation and fractional distillation
(iii) paper chromatography
Target Group: Secondary One Express Students
Duration: 1 hour (2 periods)
Big Idea: Interaction of Physical States
Instructions for Teachers:
(1) Get your students into groups of 4 or 5. There will be about ten groups. 5 groups will do on solid-solid mixtures and 5 groups will do on liquid-liquid mixtures.
(2) A Wikispace will be set up for students. Each class will have a Class Page.
(2) Each group will be assigned a scenario to discuss in the Discussion Forum.
(3) After discussing, they will proceed to Webspiration to draw up a concept map on their learning .
What are the ICT skills required?
(1) Embedding of videos of the practicals that they have done and concept maps on the Wikispace
(2) Use of Discussion Forum
(3) Use of Webspiration
Extension
Carry out related experiments in the lab in school.
Research on how these separations techniques are used in industry and commercial areas. Real life applications of the separation techniques.
Solid - solid mixture
Can you help out a desperate Mrs Loh?
While Mrs Loh was scooping out salt from a container, the loose diamond from her diamond ring got disengaged and it was lost in the
salt. She panicked. The diamond ring was of sentimental value to her. Discuss with your friends on what you can do to retrieve the diamond for Mrs Loh. Thrifty Mrs Loh wants her salt back. Can you help her get the salt as well? If Mrs Loh is able to retrieve the salt, explain your suggestion.
Can you help Mr Loh?
Iron and steel are the world's most recycled materials, and among the easiest materials to reprocess, as they can be separated magnetically from the waste stream.
The iron and steel that are separated are recycled via a steelworks: scrap is either remelted in an electric arc furnace (90-100% scrap), or used as part of the charge in a Basic Oxygen Furnace (around 25% scrap). Any grade of steel can be recycled to top quality new metal, with no 'downgrading' from prime to lower quality materials as steel is recycled repeatedly.
Given the limited resources of Mother Earth, resources should be recycled as much as possible. In Singapore, there are four incinerators (Ulu Pandan, Tuas, Senoko and Tuas South). Mr Loh is an engineer with Senoko Incinerator Plant and he is tasked to design a system to separate iron and steel from the rubbish. How will you design the system?
Liquid- liquid mixture
Can you assist the clumsy Mr Bo Tao Now?
The clumsy Mr Bo Tao Now has accidentally pour some ethanol into a beaker of water. he observes that a colourless solution is formed. What do you think he can do to separate ethanol from the solution?
Can you help Alice nail down the culprit?
One day, Yvonne fell out with her three best friends, Alice, Betty and Cathy in class. The very next day, Yvonne found her bag spilled with some black ink. She confronted her three classmates but none admitted. So she secretly took away the black pens from her friends. With the ink spill on her bag and the black pens, can you help Yvonne to identify the culprit?
Separation Techniques
Learning Outcomes:
By the end of the lesson, students should be able to:
(1) Describe methods of separation and purification for the components of the following types of mixtures:
(i) solid-solid (ii) solid-liquid (iii) liquid-liquid (miscible and immiscible)
(2) Techniques to be covered for separations and purification include:
(i) use of a suitable solvent, filtration and crystallisation or evaporation
(ii) distillation and fractional distillation
(iii) paper chromatography
Target Group: Secondary One Express Students
Duration: 1 hour (2 periods)
Big Idea: Interaction of Physical States
Instructions for Teachers:
(1) Get your students into groups of 4 or 5. There will be about ten groups. 5 groups will do on solid-solid mixtures and 5 groups will do on liquid-liquid mixtures.
(2) A Wikispace will be set up for students. Each class will have a Class Page.
(2) Each group will be assigned a scenario to discuss in the Discussion Forum.
(3) After discussing, they will proceed to Webspiration to draw up a concept map on their learning .
What are the ICT skills required?
(1) Embedding of videos of the practicals that they have done and concept maps on the Wikispace
(2) Use of Discussion Forum
(3) Use of Webspiration
Extension
Solid - solid mixture
Can you help out a desperate Mrs Loh?
While Mrs Loh was scooping out salt from a container, the loose diamond from her diamond ring got disengaged and it was lost in the
salt. She panicked. The diamond ring was of sentimental value to her. Discuss with your friends on what you can do to retrieve the diamond for Mrs Loh. Thrifty Mrs Loh wants her salt back. Can you help her get the salt as well? If Mrs Loh is able to retrieve the salt, explain your suggestion.
Can you help Mr Loh?
Iron and steel are the world's most recycled materials, and among the easiest materials to reprocess, as they can be separated magnetically from the waste stream.
The iron and steel that are separated are recycled via a steelworks: scrap is either remelted in an electric arc furnace (90-100% scrap), or used as part of the charge in a Basic Oxygen Furnace (around 25% scrap). Any grade of steel can be recycled to top quality new metal, with no 'downgrading' from prime to lower quality materials as steel is recycled repeatedly.
Given the limited resources of Mother Earth, resources should be recycled as much as possible. In Singapore, there are four incinerators (Ulu Pandan, Tuas, Senoko and Tuas South). Mr Loh is an engineer with Senoko Incinerator Plant and he is tasked to design a system to separate iron and steel from the rubbish. How will you design the system?
Liquid- liquid mixture
Can you assist the clumsy Mr Bo Tao Now?
The clumsy Mr Bo Tao Now has accidentally pour some ethanol into a beaker of water. he observes that a colourless solution is formed. What do you think he can do to separate ethanol from the solution?
Can you help Alice nail down the culprit?
One day, Yvonne fell out with her three best friends, Alice, Betty and Cathy in class. The very next day, Yvonne found her bag spilled with some black ink. She confronted her three classmates but none admitted. So she secretly took away the black pens from her friends. With the ink spill on her bag and the black pens, can you help Yvonne to identify the culprit?